People walk down a flooded street as they evacuate their homes after the area was inundated with flooding from Hurricane Harvey on August 28, 2017 in Houston, Texas.
Getty Images

Over the weekend, Hurricane Harvey slammed into the Gulf Coast, destroying homes and infrastructure in Texas, displacing tens of thousands of people, and killing at least eight. As many as 13 million people are under flood watches and warnings.

After landfall, officials ordered several Houston-area counties to evacuate, due to fears of more flooding. Experts are forecasting up to 50 inches of rain in and around Houston, making many homes inhabitable. An estimated 30,000 people will likely need to find refuge in shelters, since flooding will linger, according to The Washington Post.

Victims in Texas and Louisiana will likely need millions of dollars in aid. On Monday, President Donald Trump said he believes Congress will act swiftly to provide funding to affected areas. Charities — both big and small — will also step in.

But not all charities are created equal. Charity Navigator, a nonprofit that has independently rated over 8,000 charities, compiled a list of some of the best organizations to donate to in the wake of Harvey. Its team considers several factors when giving a charity a score out of 100. These include program expenses (e.g. how much of the donations go straight to victims) and transparency (e.g. audited financials prepared by an independent accountant).

The charities that Charity Navigator recommends for Hurricane Harvey, along with their scores out of 100, are below.

Note: Right now, it is not clear whether all these organizations will spend 100% of donations received on Hurricane Harvey relief and associated expenses. But in past large-scale disasters, high percentages of donations have directly gone to victims.

Local organizations: Greater Houston Community Foundation, Houston Food Bank, United Way of Greater Houston, South Texas Blood and Tissue Center, Food Bank of Corpus Christi, Houston Humane Society, San Antonio Humane Society, Catholic Charities of the Archdiocese of Galveston-Houston, and the L.G.B.T.Q. Disaster Relief Fund.

Volunteers from Houston Food Bank.
Houston Food Bank

These local charities have all received scores between 85 and 100, and work in the most heavily affected areas of Houston.

Sara Nason, a Charity Navigator spokesperson, told Business Insider that choosing between donations to a local or national organization is a matter of preference. The main thing to look for is that the charity is an established and highly-rated organization.

"Local organizations will continue to work in the community long after the disaster has happened, as they have an established presence in the community. National and international organizations deal with disasters at a large scale, with an established infrastructure and coordinated teams that specifically hold a skill-set for responding to crises," she said in an email.

Islamic Relief USA — 92.92

Islamic Relief USA

Islamic Relief USA aims to alleviate suffering, hunger, illiteracy, and diseases worldwide. Launched in California in 1993, the nonprofit works on a variety of projects, including education and training, water and sanitation, income generation, orphan support, health and nutrition, and emergency relief.

SBP — 93.66

St. Bernard Project

Founded in 2006 after Hurricane Katrina, SBP (also known as St. Bernard Project) works out of a parish near New Orleans. After disasters, the organization rebuilds homes, advocates for recovery strategies, and advises policy makers, homeowners, and business owners about resilience.

Brother's Brother Foundation — 94.42

Brother’s Brother Foundation

Brother’s Brother Foundation, a Pittsburgh-based international charity, has provided over $4 billion of medical supplies, pharmaceuticals, textbooks, food, seeds, and other humanitarian supplies to people around the world in 149 countries since 1958.

Samaritan's Purse — 96.32

Samaritan's Purse

Samaritan's Purse is a nondenominational, Christian organization that provides spiritual and physical aid to people affected by disaster and poverty around the world. It focuses on helping victims of war, poverty, natural disasters, disease, and famine.

Heart to Heart International — 96.46

Heart to Heart International

Heart to Heart International is a humanitarian organization that aids millions of people in more than 60 countries, including the US, every year. The Kansas-based nonprofit enlists volunteers and works with local organizations to make a high impact on the communities it serves.

DonorsChoose.org — 96.66

DonorsChoose.org

Founded in 2000, DonorsChoose.org allows users to fund specific project requests from teachers in US public schools. Donors choose and give money to a project that they're passionate about, and then they hear back from the classroom with photos and updates.

Matthew 25: Ministries — 97.17

Matthew 25 Ministries

Matthew 25: Ministries is an international humanitarian aid and disaster relief organization that helps the poor locally, nationally and internationally, regardless of race, creed, or political ideology.

By collecting products from major corporations, manufacturers, hospitals, and individuals, the nonprofit provides basic necessities, skill development, and disaster relief. It was founded in 1991.

All Hands Volunteers — 96.66

All Hands Volunteers

All Hands Volunteers works to address the long-term needs of communities affected by disasters. Over the last 12 years, the organization has enlisted over 39,000 volunteers who helped 500,000 people worldwide.

Medical Teams International — 96.70

Medical Teams International

Medical Teams International is a Christian global health organization based in Portland, Oregon. It sends teams of volunteer health professionals to carry out disaster relief, long-term development and community health programs with local partners, ships millions in humanitarian aid to countries around the world, and provides mobile dental care to those in need in the US.

Americares — 97.23

Americares

Since its founding in 1979, Americares has provided more than $13 billion in aid to 164 countries, including the United States. It is headquartered in Stamford, Connecticut, and specializes in fighting ongoing health crises.